The invention provides a solar heat collector and a seawater desalination system comprising the same. The solar heat collector comprises heat collection tubes, wherein every two adjacent heat collection tubes are connected by the aid of a heat collection plate, so that the multiple heat collection tubes and the adjacent heat collection plates form a tube-and-plate structure. A solar heat collector system comprises two tube-and-plate structures, a certain included angle is formed by the two tube-and-plate structures, the heat collection tubes have rectangular cross sections, and the heat collection plates are connected with corners of the rectangles. The novel solar heat collector and the seawater desalination system can improve the solar heat absorptivity, so that the desalination efficiency of the seawater desalination system can be improved.